Why am I experiencing waves of heat in my body?

You can do a home pregnancy test and also go to a gynecologist. They may recommend blood test and ultrasound to confirm the pregnancy

The probability of pregnancy from the situation you described was quite low because you took the necessary measures after the unprotected encounter. Although light bleeding might have been caused by the pill's side effects, like irregular bleeding, this is not a sign of pregnancy. This idolizes the truth that hormonal changes can cause such and such. It is common and does not mean you are pregnant. If you're worried, taking a pregnancy test can provide reassurance. 

If you are observing a shorter than usual menstrual period, it could be that the cause is stress, hormone imbalance or a certain drug. It is advisable to visit a physician who specializes in women's reproductive health in order to diagnose the problem and to receive proper treatment.
 

It is not recommended that a person take multiple medications together without consulting a doctor as it can lead to interactions and unwanted effects. It is advisable to consult a gynecologist in order to obtain the relevant medical care you need. A gynecologist may tell you about the right choices of contraceptive methods as well as the possible side effects.